%I
%S 0,0,1,2,3,12,49,460,4994,68234,997486,15582567,253005521,4250680376,
%T 73293572869,1293638724177
%N Number of planar graphs of order n with exactly one Hamiltonian cycle.
%H Jan Goedgebeur, Barbara Meersman, and Carol T. Zamfirescu, <a href="https://arxiv.org/abs/1812.05650">Graphs with few Hamiltonian Cycles</a>, arXiv:1812.05650 [math.CO], 2018.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PlanarGraph.html">Planar Graph</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/UniquelyHamiltonianGraph.html">Uniquely Hamiltonian Graph</a>
%Y Cf. A307956.
%K nonn,more
%O 1,4
%A _Jan Goedgebeur_, May 08 2019
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